LG M2250D Service Manual page 65

Standard Repair Process Detail Technical Manual
symptom
LCD TV
Content
<ALL MODELS>
Checking order when there is no audio
1. Measure the 19V input voltage supplied from Adopter
(If there is no input voltage, replace power board or connector )
2. Connect the tester RX1 to the speaker terminal and if you hear the Buzzer sound
when you touch the GND and output terminal, the speaker is normal.
3. Check signal input to the Audio amp IC. Such as below
- MCLK ( master clock) : 12.288 MHz
- RESET : normal status is high
- VDD (Power)
- LRCLK : 48KHz
- SCLK : 3.072MHz
Error
C. Audio error_No audio/Normal video
Voltage and speaker checking method
when there is no audio
Established
date
Revised
date
A25
2011. 01 .18
A25
Audio
Amp
IC
ⓒ LG Electronics. Inc.2011